public static void EliminateDuplicates(SudokuModel model, int col, int row)
{
if (model.IsSolved(col, row)) {
var value = model.GetValue(col, row);
foreach (var region in model.GetIntersectingRegions(col, row)) {
foreach (var other in model.GetCells(region.Type, region.I)) {
if (other.Column != col || other.Row != row) {
model.Eliminate(other.Column, other.Row, value);
}
}
}
}
}
protected override void OperateOn(SudokuModel model)
{
// We could look at all 2^N possible sets on all 3N of the model's regions,
// but it is more efficient to only use the
// possiblity set of each cell, and isolate that set on each intersecting region.
for (var row = 0; row < model.Size; ++row) {
for (var col = 0; col < model.Size; ++col) {
if (!model.IsSolved(col, row)) {
foreach (var region in model.GetIntersectingRegions(col, row)) {
var checkedIter = GetCheckedIteration(region);
if (checkedIter < model.GetLastChangedIterRegion(region.Type, region.I)) {
_checkedIteration[region] = checkedIter;
IsolateSet(model.GetPossibilitySetCell(col, row), region, model);
}
}
}
}
}
}